James pollock



Nom 9 1926.

J. POLLOCK FURNAGE FOR BURNING FINE FUEL 2 Sheets-Sheet 1 Filed July 1 5, 1925 Nov. 9 192s. 1,606,720

J. POLLOCK FURNACE FOR BURNING FINE FUEL Filed July l5. 1925 2 Sheets-Sheet 2 lll Ell

Patented Nov. 59, 1926.

JAMES POLLOCK, OF NEW YORK, N. Y.

FURNACE FOR BURNING FINE FUEL.

Application led July 13, 1925. Serial No. 43,183.

This invention rela-tes to improvements in furnaces for burning line fuel in suspension. In my Patent No. 1,530,321, dated March 1.7, 1925, I have shown a furnace in which the fuel is blown upwardly through a nozzle into a furnace chamber which is circular in cross sect-ion and which gradually enlarges in diameter from the bottom upwardly, and in which I have provided means for blowing air upwardly into the chamber adjacent the nozzle to maintain an upward draft in all parts of the chamber and to return particles of fuel 0r foreign substances which may drop to the bottom of the furnace. I have also shown meansfor 'forcing air into the fur nace chamber at various points in its height, so as to supplyV the necessary oxygen for complete combustion of the gasesevolved from the fuel. The present invention is in the nature of an improvement upon the invention described in said Letters Patent. It is found, in practice, that the coarser par ticles of material blown upwardly intov the furnace through the central nozzle, owing to their inertia, rise higher than the finer fuel and are apt to be blown out of the chamber. To remedy this, I provide in each fuel injectingnozzle a spiral baffle which gives the fuel a swirling motion as it leaves the nozzle, and by this arrangement the heavier particles are thrown by centrifugal force toward the wall of th-e furnace, instead of being pro jected in a vertical line, while the liner fuel does not travel directly to the wall but tal-wrl initially a more central position in the furnace chamber. The coarser particles are thus prevented from being projected too high in the furnace, and all'of the fuel injected is held in suspension.

In the present invention, I have shown the furnace in several connected sections, each section being providedk with a fuel injecting nozzle and the spiral deflcctors in the adje1 cent nozzles being reversely arranged, and l. have also shown means for admitting air laterally into the several sections at different `points in the'height of the furnace, the air inlets being located and directed so as to cause a swirl of the fuel and gases in the same direction as rthe swirl caused by the respective spiral deiiectors .in the nozzles. In this way, the air, gases and fuel are intermingled without having the currents in one part of the furnace opposed by currents in an adjacent part. l

In the Iaccompanying drawing,

Fig. 1 is a horizontal section through the furnace;

Fig. 2 is a section on the line 2 2 of Fig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 1; and, l o

Fig. d is an enlarged sectional view through one of the nozzles and adjacent parts of the furnace. i Referring to the drawing, a represents the outer wall of the furnace which, as shown, flares outwardly and upwardly from the bottom, and Z) indicates the combustion chamber enclosed by said wall. the combustion chamber is divided into a plurality of compartments 1, 2, 3, and l by partitions 5, 6, and 7. Each compartment has a wall formed in cross section on arcs of circles and upwardly flaring, and the'chamber wall above the partitions is fluted in continuation of the arcuate walls of the several compartments. Thus, the conical eompait ments merge into one another above the aan titions, and the inner wall of the upper part. of the furnace chamber has the arcuate surfaces 1, 2a, etc., concentric Vwiththe of the fuel injecting nozzles c, c', etc. The fuel injecting nozzles are the saine as in my patent referred to above, except that within the bore of thenozzle is arranged a spiral battle 8, as shown in Fig. 4l. The line fuel is fed to the various nozzles byscrew conveyers contained in pipes 9 and is blown upwardly through the nozzle by air l ted from a pipe 10, or a pipe 11. rlhe baffle causes the fuel and air to enter nace'chamber with a swirlrng motion and the coarser particles of fuel instead of projected straight upnlardly in the cha l, wher-e they would pass beyond the liner incl, are thrown outwardly toward the wall yand are held in suspension by the upward draft fromthe nozzle and from the orifice 12, surA4 rounding the nozzle through which air if; forced from the pipe v10 or pipe. 11.

Thespiral baffles in the nozzles in the successive compartments are reiferselv and the air .as well as the fuel inj c through the successive i nozzles is given a swirling motion in opposite directions4 as indicated by the small arrows iny Fig. l, .as in the structure of my prior patent, I provide .means for admitting air to the combustion chamber, through pipes d, at various points in the height of the furnace, for the purpose of supplying the necessary oxygen The lower party of lil) lili

to support combustion, .and the air inlet openings 13 and 14e above each compartment are at one` side of the axis of the compart ment, so as to give the air a swirling motion in the same direction as-the swirling motion -given to the air and fuel by the nozzle of motion causes an intimate mixture of the. air

and Igases and the freshfand ignited fuel.

i rllhe fuel is ignite-d initially the vuse vof suitable oil burners 15, projecting into each compartment, as described in Vmy prior patent. and the heatV `and gasesv from the furnace chamber are carried .off through a downwardly turned flue 16, as described in my co-pending application lSerial Number 25,758, filed April 25, 1925.

It is believed that the operation of the furnace will be clear from `the foregoing without further description.

`What I claim is:

1. In a furnace for Vburningfine fuel inV suspension, an upwardly flaring combustion chamber, an yupwardly directed fuel nozzle at the lower end` of said'chamber, a spiral deflector in the nozzle, and means for blowing air and fuel into the chamber through the nozzle. Y

2. In a furnace for burning fine fuel in suspension, an .upwardly flaring combustion chambenan upwardly directed fuel nozzle at the lower end of said chamber, a spiral defiector in the nozzle, an 4annularair inlet surrounding the nozzle, means for blowing air and fuel into the chamber through `the nozzle, and means for blowing air through said rair inlet into the chamber.

3. In a furnace for burning line fuel in suspension, a furnace chambercomprising an upwardlyflaring wall, partitions dividing the lower part of the chamber into upwardly flaring compartments, upwardly d1- Yrected fuel nozzles at the lower ends of the several compartments, a spiral deflector in each nozzle, and means for blowing fuel into the chamber through said nozzles.

ll. In a furnace for burning fine fuel in suspension, .a furnace chamber comprising an upwardly flaring wall, partitions dividing the lower part of the chamber into upwardly flaringcompartments, upward-ly directed fuel nozzlesat the lower ends of the several compartments, a spiral defiector in each nozzle, the spirals in the'successive noz zles being oppositely inclined, and means for blowing fuel into kthe chamber through said nozzles.

Y 5. In a `furnace for burning fine fuel in suspension, a 'furnace chamber comprising an outer wall and partitions dividlng the lower part of the chamber into compartments, said compartments having (walls.

formed in cross-section on arcs vof circles and upwardly flaring and the chamber wall abovethe partitions being. fluted in continuation of the arcuate wallsof the several coinpartments and upwardly flaring, fuel nozzles upwardly directed at the lower ends of the severalv compartments, andl means for .blowing air and fuel into said chamber through the nozzles'. i

6. In furnace forburningfne fuelin suspension, a furnace chamber comprising an outer wall and partitionsY dividing the lower part of the chamber'into compartments, compartments having walls formed in cross-section. on arcs'of circles and upwardly flaringand the. chamber wall above the partitions being fluted in continuation ofthe arcuate wallsof theseveral com-V partments and upwardly flaring, fuel noz zles upwardly directed lat thelower endslof the several compartments, a spiral defiector in each nozzle,V and ymeans for blowing airy several compartments, a spiraldeflector in each nozzle, the spirals'in thesuccessive nozzles being oppositely'inelined, and means for blowing air andfuel into said Lclnunber through the nozzles.

8. In a furnace for burning fine fuel in suspension, a furnace chambercomprising an outer wall and partitions Vdividing the lower part of the chamber into compartments, vsaid compartments having walls formed in cross-section on arcs of circles and outwardly flaring .and the Achamber wall above the partitions being futed in continuation of the arcuate walls of the several com-k partments and upwardly flaring, means for blowing air and fuel into said compartments in such manner' as to cause the air and' fuel in adjacent compartments to circulate in opposite directions, and meansfor admitting air laterally linto the chamber at signature.

JAMES -POLLOGK. 

